Fan



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BY Jmw/Mi Z4! -4 May 15, 1956 Filed Jan. 13, 1953 D. C. SINCLAIR ET AL INVENTOR.

United States Patent FAN Donald C. Sinclair, South Hadiey Falls, and Samuel Wallans, Springfield, Mass, assignors to Harvey-Whipple, Incorporated, Springfield, Mass., a corporation of Massachusetts Application January 13, 1953, Serial No. 331,012

1 Claim. (Cl. 230-134) This invention relates to improvements in fans or air propellers and the principal object of the invention is the provision of an improved fan construction particularly adapted for supplying air to oil burners and the like.

According to special features of the invention, the fan is constructed and arranged for use in connection with a duct for delivering air to oil burner apparatus.

It is common practice to supply air to the air tube of oil burner apparatus by fans or blowers with which considerable dissatisfaction has resulted and which is overcome by the novel features of this invention.

According to this invention, a fan is provided which is adapted for high speed operation, and high pressures, has heat dissipating characteristics, is self-cleaning and is efficient in operation.

All of the above objects are accomplished by means of such structure and relative arrangements of parts thereof, as will fully appear by a perusal of the description below and by various specific features which will be hereinafter set forth.

To the above cited and other ends and with the fore going and various other novel features and advantages and other objects of my invention as will become more readily apparent as the description proceeds, my invention consists in certain novel features of construction and in the combination and arrangement of parts as will be hereinafter more particularly pointed out in the claim hereunto annexed and more fully described and referred to in connection with the accompanying dravw'ngs where- Fig. l is an elevational view of a fan construction embodying the novel features of the invention; and

Fig. 2 is a sectional elevational view on the line 22 of Fig. 1.

Referring now to the drawings more in detail, the invention will be fully describd.

The fan 2 of the invention has a main disc 4 which will preferably be formed from sheet metal so as to be light in weight. The peripheral edge 6 thereof is curled as shown for stiflness and strength.

Blades 10 formed from sheet metal have flanges 12 formed thereon which are disposed on the disc 4. Said blades are arranged to extend radially relative to the axis of rotation of the fan and outer ends 14 thereof are curved forwardly relative to the direction of rotation of the fan which is indicated by arrow a. A rear plate 16 is disposed on the rear face of the disc 4 and a forward cap plate 18 is disposed on the forward face thereof, as shown.

The plates 4, 16 and flanges 12 of the blades 10 are secured together preferably by rivets 20 to provide an integral structure.

A hub 22 extends reamvardly from the plate 16 and is provided with axially spaced annular cooling fins 24, a flange 25, and a grooved pulley 26. Said flange, hub, fins and pulley are preferably integral.

The hub 22 is bored at 28 to receive a shaft to which it will be secured by a set screw 30 or the like. Said shaft may be that of a motor by which the fan is operated, or, of course, the fan may be operated by other means.

The blades 10 adjacent their inner ends have outer edge portions which are stepped rearwardly as shown in Fig. 2 for cooperation with a lip of an air inlet of a duct in which the fan may be mounted for rotation.

The hub has a central pilot portion 34- fitting in openings provided therefor in the members 4 and 16 as shown and said plates 4 and 16, the cap 18 and the flange 25 as well as the fins 24 of the hub 22 are provided with aligned openings 36.

Screws 38 extend through the cap 18 and plates 4 and 16 and are in threaded engagement with the flange 25 of the hub for securing the parts in rigid relationship. The main plate has an annular reinforcing and stiffening depression or groove 40 formed therein, as shown.

The blades being curved at their outer ends direct the air in the desired direction and are not only adapted to displace a great volume of air at considerable pressure but tend to throw outwardly any foreign substances taken 1n.

The novel construction provides a fan which is strong and rigid so as to be adapted for high speed operation. The openings 36 contribute to the ability of the fan to dissipate heat so that it operates at the speeds desired without being impaired by elevated temperatures.

The invention may be embodied in other specific forms without departing from the essential characteristics thereof. Hence, the present embodiments are therefore to be considered in all respects merely as being illustrative and not as being restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all modifications and variations as fall within the meaning and purview and range of equivalency of the appended claim are therefore intended to be embraced therein.

What it is desired to claim and secure by Letters Patent of the United States is:

A fan construction for rotation in a certain direction comprising, a hub having a shaft bore provided with a longitudinal axis, a sheet metal circular disc having a rear face secured to said hub and provided with a forward face, a plurality of elongated flat sheet metal blades having inner and outer longitudinal edges and provided with flanges secured to the inner edges in right angular relation to said blades and terminating inwardly of outer ends thereof providing outer free ends, the flanges secured to the forward face of said disc and arranged to space said blades circumferentially of the face in radial planes extending through the longitudinal axis with the free ends extending beyond the periphery of said disc and inner edges of said blades adjacent the face, the outer edges of said blades being unconnected and the outer free ends thereof outwardly of the periphery of said disc being curved forwardly in the certain direction of rotation of the fan.

References Cited in the file of this patent UNITED STATES PATENTS 509,321 Marsden Nov. 21, 1893 1,548,082 Wise et a1. Aug. 4, 1925 1,556,203 Clarage Oct. 6, 1925 1,773,909 Korb Aug. 26, 1930 1,882,519 Pfeifer Oct. 11, 1932 2,054,144 SWigert Sept. 15, 1936 2,360,440 Muller et a1 Oct. 17, 1944 FOREIGN PATENTS 38,390 Switzerland Oct. 17, 1906 131,885 Switzerland May 16, 1929 

